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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f12ec3650086224f1655b57a497dee3f5010a65259d5f1a16fb2cf80a4ac57' 
  AND token = 'cpAzeeT/hscraJBjTxbSSGF5bEUfQZ+MvsGJSOVdte0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}